Killsec
Since Mar 21, 2024, Killsec has listed 286 organizations on its leak site.
Listings per month
- Total listings
- 286
- First listing
- Mar 21, 2024
- Latest listing
- Sep 18, 2026
- MITRE ATT&CK techniques
- 0
KillSec originated as a hacktivist group aligned with the Anonymous movement before pivoting to ransomware operations in October 2023, officially launching a RaaS platform in June 2024 with an affiliate-friendly 88% revenue split, primarily targeting healthcare, financial services, and government sectors with over 250 documented victims as of late 2025.
It posted 33 listings in the last 12 months; the busiest month was December 2025 (8 listings).
Most targeted country: United States, with 87 listings (30% of the total).
Most targeted sector: Professional Services, with 50 listings (17% of the total).
Targeted countries
Showing 10 of 286 results
What does a ransomware group do?
Ransomware groups break into corporate networks, move data out and encrypt systems. If the ransom is not paid, they list the organization on a leak site and threaten to publish the data.
What should you do if your organization is listed on a leak site?
- Record the listing and any published sample files; do not visit the leak site from the corporate network.
- Isolate affected systems and preserve logs without deleting them.
- Determine which data left the organization; if personal data is involved, review notification obligations with your legal team.
- Make any decision about the ransom demand together with legal, management and incident response.
- Do not bring systems back online before the attacker’s entry point is closed.
Is your organization mentioned?
Search with your domain to check whether your organization appears in ransomware listings, leaked records, forums and Telegram channels.
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Customer intelligence on top of Infostealer Detection: leaked accounts of end users who sign in to your site.